Process of applying sanitary linings to can ends.



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Specification of'Letters Patent.

Patented Apr.. 23, IFI

Application led February 23, 1917. Serial No. 150,444.

To all whom zt may concern:

lBe. it known that I, CHARLES D. MclDoNALD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Processes of Applying Sanitary Linings to Can Ends, of which the following is a specification.

The present invention relates to a process of coating a sheet of material, preferably thin metal, in such manner to enable the production of lined sanitary can ends in a quicker and more economical manner than such ends have heretofore been produced.

The primary object of the invention is to take a sheet of metal, from which a number of sanitary can ends can later be produced, and to cover a portion of the surface of this sheet with a lining composition, Whereby when said ends are produced from said sheet, they will have a portion thereof lined with a-sealing compound, which lining is characteristic 'of such ends.

A further object of the invention 1s to arrange the coating of lining composition' upon the sheet of metal whereby undue waste of the same will not occur, and whereby the' can end when produced will have a lining positioned in a fashion similar to the linings now employed.

'Ihe invention further consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawings:

Figure 1 is a face view of a sheet of metal having a lining compound applied to one surface thereof in accordance w1th the pres-` ent inventiong Fig. 2, a detail showing a strip of metal severed from the sheet and of a character to be fed into the die-press for the production of can ends; Y

Fig. 3, an under face view of one of the completed can ends; and

Fig. 4, a cross-section of the end shown in Fig. 3.

In the 'art to which the present invention relates, and connected with the manufacture of cans, there is produced what is known as a sanitary can end. 'Ihis can end is formed with a groove adjacent its outer edge, in which is placed a sealing compound or a paper gasket, which will tend to prevent leakage of air, etc., when the can end is assembled to the can body.

In the present invention, it is intended, at a single operation, to place the lining composition upon the material, so that the 1111er for a plurality of said ends is applied .at one operation, and so fai' as the lining is metal is positioned in the drawings, and no other limitation than the above is intended by theseterms.

The sheet of metal is subjected to the .ac tion of a lithographing press, or otherwise, to place upon a portion of one surface thereof, a coating of liner composition 9. This composition may be of any suitable form, and a formula which is adapted to produce a suitable composition is as follows:

Calcium carbonate Iron oxid 5 per cent. Rosin 15 per cent.

As stated, the above formula is the most suitable for practising the invention, of which I am aware, but, of course, the inven# tion is not intended to be limited in any way to the use of a substance having the formula specified.

In placing the composition upon the sheet, certain portions 10 of the sheet are left uncovered. rlFhese portions form spaces which occur at regular intervals in lines extending from side to side of the sheet, and said lines occur at regular intervals from the top to the bottom edge of the sheet. These uncovered portions 10 will form the center of the can end when said end is formed by the action of the diefpress It is not desirable or necessary to line the entire inner surface of the end, and by placing the coating upon the sheet in the manner described, the ends when formed will have the lining material only along the inner surface of the outer groove, as is customary.

' After the sheets have been treated a above, .and the liner compound applied, they are placed in a shearing machine, of

(Whiting) per cent. i

soA

the character embodied in my Patent No.

1,174,747, issued March 7, 1916, and entitled strips are fed into the die-press a`nd thedie acts to cut the can ends out therefrom. The cuts of the die-press are shovvnby means of the dotted circles 15, and, as will be seen,

the lined portions of the material extend around the outer portion of the cut parts'.

The strip illustrated in Fig. 2 is of the form Which Would-be produced through the cutting of the sheet by the shearing machine disclosed in the above-described patent, but,

yof course, the size and configuration of the strip could be varied Without departing from the present invention. The ends 12,

which are produced from the strip 11, are of the character shown in Figs. 3 and 4, andcomprise a depressed center `portion 13, surrounding Which is a groove or channel 14, which is lined with the sealing substance 9.

Referring back to Figs. 1 and 2 and comparing themwith Fig. 4, it will be very apparent how, by placing a liner substance on the surface of the sheet of metal in the inanner described, said sheet when subjected to the action of a die-press to produce the can ends Will produce an end which 'Will have the lining substance positioned within the outer groove thereof, Yand will therefore have the lining positioned in conformity to the linings of the standard form of sanitary can ends.

It will also be apparent that by the single i lithographing operation which places the liner substance on the sheet 10, the lining for a plurality of can ends is placed in position at asingle and relatively quick operation.

After lacing the compound upon the surface oft e sheet, the said sheet can be subjected to a baking operation to firmly set the compound in pos1tion; and the compound is of such a nature that When baked, it will not be hard to the extent that it Willl crack underthe eHect of the action of the die in forming-the can end, and at the same time it will be sufficiently hard so that it will not scrape of by lhandling the sheets in cutting them up into strips and feeding the strips through thedie-press.

If it is found that one coating of the lining substance does not make avlining suiciently thick for the work intended, a second coating can be readily a plied after the rst one. has dried. Thus, t e character of the lining can be adapted as desired to particular forms of Work.

I claim:

1. The process ofapplying sanitary linings tocan ends, which consists in taking a sheet .of metal and applying a sanitary lining substance in liquid form thereto, said substance being applied in a manner to cover a part of one surface of said sheet, the uncoated portion of said surface being of circular formation and occurring at regular intervals in lines extending from one edge of the sheet to the other`with the uncoated portions in one line arranged in staggered relation to the uncoated portions in the next line, then cutting the sheet to produce a plurality of can ends therefrom with the uncoated portions positioned at the center of the ends and the coated portions at the outer edge thereof, substantially as described. 2..The process of applying sanitary linings to can ends, which consists in taking a sheet of metal and applying a sanitary lining substance in liquid form thereto, said -substance being` applied in a manner to cover a part of one surface of said sheet, the uncoated portions of said surface being of circular formation and occurring at regular intervals in lines extending from one edge of the body to the other with the uncoated portions of one line being in staggered relation to the uncoated portions 1n the next line, then cutting the sheet in undulating lines of-cut extending between the lines of uncoated ortions to form a series of elongated scro l-edged strips, then cuttingsaid strips to produce a plurality of can ends therefrom, with the uncoated portions positioned at the center of the ends and the coated portions at the outer edge thereof, substantially as described.

CHARLES D. McDONALD. 

